Review the 'Possible Causes' mentioned above and visually examine the corresponding wiring harness and connectors. Ensure to check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.
There are factory service bulletins for the following Toyota models:
Toyota RAV4
Toyota Tercel
Toyota Paseo
Toyota Camry
Toyota Avalon
Toyota Tacoma
Toyota 4Runner
Toyota T-100
Toyota Factory Service Bulletin OBDII Code P0446
2003 – 2004 Toyota Corolla
2003 – 2005 Toyota Matrix
Toyota Factory Service Bulletin OBDII Code P0446 Corolla and Matrix
If P0446 is combined with P0440 and P0441 use this bulletin:
2000-2003 Toyota Solara
2000-2003 Toyota Avalon
2000-2003 Toyota Camry
2001-2003 Toyota Sienna
Toyota Factory Service Bulletin OBDII Code P0446 Solara, Avalon, Camry, Sienna
2003-2004 Toyota 4Runner
2003-2004 Toyota Tundra
2004 Toyota Camry
2004 Toyota Sienna
2004 Toyota Highlander
2004 Toyota Solara
Toyota Factory Service Bulletin OBDII Code P0446
If only P0446 is present:
2001-2003 Toyota Sienna
Toyota Sienna Factory Service Bulletin OBDII Code P0446
To diagnose the P0446 Toyota code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour.
The Evaporative System (EVAP) canister vent control valve is located on the EVAP canister and is used to seal the canister vent.
This solenoid valve responds to signals from the Engine Control Module (ECM). When the ECM sends an ON signal, the coil in the solenoid valve is energized. A plunger will then move to seal the canister vent. The ability to seal the vent is necessary for the on board diagnosis of other evaporative emission control system components. This solenoid valve is used only for diagnosis and usually remains open.
The P0446 code is triggered when an improper voltage signal is sent to Engine Control Module through the EVAP canister vent control valve.
Need more information on how to fix the P0446 Toyota code? Get Access to Factory Service Manuals
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